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c#regexregular-language

C# regular expression to parse a string sometimes containing extra space next to the digit

I am trying to alter the reg. expression below to take into account an extra space between the month and the day as follows: 

(?:(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec))\s\d{1,2}\s\d{1,2}:\d{1,2}

rats 1.4K Sep  9 08:10 /opt/rats/prod ===> it returns blank
rats 1.4K Sep 12 08:10 /opt/rats/prod ===> returns "Sep 12 08:10"

If I add \s it works in the first string but it breaks on the second string:

(?:(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec))\s\s\d{1,2}\s\d{1,2}:\d{1,2}

Thank you

Solution

  • To match exactly extra space 

    (?:(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec))\s{1,2}\d{1,2}\s\d{1,2}:\d{1,2}

    To match any count of extra spaces

    (?:(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec))\s+\d{1,2}\s\d{1,2}:\d{1,2}